# frozen_string_literal: true

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require "delegate"

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# Weak Reference class that allows a referenced object to be

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# garbage-collected.

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#

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# A WeakRef may be used exactly like the object it references.

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#

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# Usage:

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#

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# foo = Object.new # create a new object instance

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# p foo.to_s # original's class

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# foo = WeakRef.new(foo) # reassign foo with WeakRef instance

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# p foo.to_s # should be same class

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# GC.start # start the garbage collector

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# p foo.to_s # should raise exception (recycled)

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#

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class WeakRef < Delegator

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##

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# RefError is raised when a referenced object has been recycled by the

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# garbage collector

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class RefError < StandardError

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end

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@@__map = ::ObjectSpace::WeakMap.new

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##

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# Creates a weak reference to +orig+

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#

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# Raises an ArgumentError if the given +orig+ is immutable, such as Symbol,

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# Integer, or Float.

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def initialize(orig)

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case orig

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when true, false, nil

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@delegate_sd_obj = orig

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else

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@@__map[self] = orig

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end

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super

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end

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def __getobj__ # :nodoc:

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@@__map[self] or defined?(@delegate_sd_obj) ? @delegate_sd_obj :

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Kernel::raise(RefError, "Invalid Reference - probably recycled", Kernel::caller(2))

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end

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def __setobj__(obj) # :nodoc:

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end

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##

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# Returns true if the referenced object is still alive.

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def weakref_alive?

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@@__map.key?(self) or defined?(@delegate_sd_obj)

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end

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end

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